Add django-4.0 and Drop django-3.1

.github/workflows/test-examples-proj1.yml

@@ -11,7 +11,7 @@ jobs:
       max-parallel: 5
       matrix:
         python-version: ['3.10']
-        django-version: ['2.2', '3.1', '3.2']
+        django-version: ['2.2', '3.2', '4.0']
         include:
           - django-version: 'main'
             python-version: '3.10'

.github/workflows/test.yml

@@ -11,7 +11,12 @@ jobs:
       max-parallel: 5
       matrix:
         python-version: ['3.6', '3.7', '3.8', '3.9', '3.10']
-        django-version: ['2.2', '3.1', '3.2']
+        django-version: ['2.2', '3.2', '4.0']
+        exclude:
+          - django-version: '4.0'
+            python-version: '3.6'
+          - django-version: '4.0'
+            python-version: '3.7'
         include:
           - django-version: 'main'
             python-version: '3.9'

CHANGES.rst

@@ -41,7 +41,9 @@ Bug Fixes:
 Features:
 
 * #82 Add Python-3.10 support.
+* #98 Add Django-4.0 support.
 * #82 Drop Django-3.0 support.
+* #98 Drop Django-3.1 support.
 * #90,#13,#8: Support `manage.py inspectdb`, also support working with the django-sql-explorer package.
   Thanks to Matt Fisher.
 * #63 Support changing a field from NOT NULL to NULL on migrate / sqlmigrate.

django_redshift_backend/base.py

@@ -14,7 +14,7 @@
 from django.utils import timezone
 from django.conf import settings
 from django.core.exceptions import FieldDoesNotExist
-from django.db.backends.base.introspection import FieldInfo
+from django.db.backends.base.introspection import FieldInfo, TableInfo
 from django.db.backends.base.schema import _is_relevant_relation, _related_non_m2m_objects
 from django.db.backends.base.validation import BaseDatabaseValidation
 from django.db.backends.ddl_references import Statement
@@ -37,6 +37,7 @@
 
 
 class DatabaseFeatures(BasePGDatabaseFeatures):
+    minimum_database_version = (8,)           # Redshift is postgres 8.0.2
     can_return_id_from_insert = False         # old name until django-2.x
     can_return_ids_from_bulk_insert = False   # old name until django-2.x
     can_return_columns_from_insert = False    # new name since django-3.0
@@ -234,8 +235,8 @@ def create_model(self, model):
         # Add any unique_togethers (always deferred, as some fields might
         # be created afterwards, like geometry fields with some backends)
         for fields in model._meta.unique_together:
-            columns = [model._meta.get_field(field).column for field in fields]
-            self.deferred_sql.append(self._create_unique_sql(model, columns))
+            fields = [model._meta.get_field(field) for field in fields]
+            self.deferred_sql.append(self._create_unique_sql(model, fields))
 
         # Make the table
         sql = self.sql_create_table % {
@@ -517,7 +518,7 @@ def _alter_field(self, model, old_field, new_field, old_type, new_type,
             self._delete_primary_key(model, strict)
         # Added a unique?
         if self._unique_should_be_added(old_field, new_field):
-            self.execute(self._create_unique_sql(model, [new_field.column]))
+            self.execute(self._create_unique_sql(model, [new_field]))
         # Added an index? Add an index if db_index switched to True or a unique
         # constraint will no longer be used in lieu of an index. The following
         # lines from the truth table show all True cases; the rest are False:
@@ -768,7 +769,7 @@ def _get_max_length(field):
             ))
             # 3. add UNIQUE, PKEY, FK again
             if unique_constraint:
-                actions.append((self._create_unique_sql(model, [new_field.column], unique_constraint), []))
+                actions.append((self._create_unique_sql(model, [new_field], unique_constraint), []))
             elif pk_constraint:
                 actions.append((self._create_primary_key_sql(model, new_field), []))
             elif fk_constraint:
@@ -871,6 +872,34 @@ def remove_field(self, model, field):
             )
             super().remove_field(model, field)
 
+    # backwards compatiblity for django
+    # refs: https://github.com/django/django/pull/14459/files
+    def _create_unique_sql(
+        self, model, fields, name=None, condition=None, deferrable=None,
+        include=None, opclasses=None, expressions=None,
+    ):
+        if django.VERSION >= (4,):
+            return super()._create_unique_sql(
+                model, fields, name=name, condition=condition, deferrable=deferrable,
+                include=include, opclasses=opclasses, expressions=expressions
+            )
+        elif django.VERSION >= (3,):  # dj32 support
+            columns = [
+                field.column if hasattr(field, 'column') else field
+                for field in fields
+            ]
+            return super()._create_unique_sql(
+                model, columns, name=name, condition=condition, deferrable=deferrable,
+                include=include, opclasses=opclasses,
+            )
+        else:  # dj32, dj22 support
+            columns = [
+                field.column if hasattr(field, 'column') else field
+                for field in fields
+            ]
+            return super()._create_unique_sql(
+                model, columns, name=name, condition=condition)
+
 
 redshift_data_types = {
     "AutoField": "integer identity(1, 1)",
@@ -1050,6 +1079,21 @@ def _get_attribute_number_to_name_map_for_table(self, cursor, table_oid):
             for _, attnum, attname in cursor.fetchall()
         }
 
+    # BASED FROM https://github.com/django/django/blob/3.2.12/django/db/backends/postgresql/introspection.py#L47-L58
+    # Django 4.0 drop old postgres support: https://github.com/django/django/commit/5371342
+    def get_table_list(self, cursor):
+        """Return a list of table and view names in the current database."""
+        cursor.execute("""
+            SELECT c.relname,
+            CASE WHEN c.relkind IN ('m', 'v') THEN 'v' ELSE 't' END
+            FROM pg_catalog.pg_class c
+            LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
+            WHERE c.relkind IN ('f', 'm', 'p', 'r', 'v')
+                AND n.nspname NOT IN ('pg_catalog', 'pg_toast')
+                AND pg_catalog.pg_table_is_visible(c.oid)
+        """)
+        return [TableInfo(*row) for row in cursor.fetchall() if row[0] not in self.ignored_tables]
+
 
 class DatabaseWrapper(BasePGDatabaseWrapper):
     vendor = 'redshift'

doc/index.rst

@@ -44,7 +44,7 @@ Support versions
 This product is tested with:
 
 * Python-3.6, 3.7, 3.8, 3.9, 3.10
-* Django-2.2, 3.1, 3.2
+* Django-2.2, 3.2, 4.0
 
 License
 =======

setup.cfg

@@ -21,8 +21,8 @@ classifiers =
     Programming Language :: Python :: 3.10
     Framework :: Django
     Framework :: Django :: 2.2
-    Framework :: Django :: 3.1
     Framework :: Django :: 3.2
+    Framework :: Django :: 4.0
     Intended Audience :: Developers
     Environment :: Plugins
     Topic :: Software Development :: Libraries :: Python Modules

tox.ini

@@ -1,7 +1,7 @@
 [tox]
 envlist =
-    py{36,37,38,39,310}-dj{22,31,32}
-    py{39,310}-djmain
+    py{36,37}-dj{22,32}
+    py{38,39,310}-dj{22,32,40,main}
     flake8
     check
 skipsdist = True
@@ -17,8 +17,8 @@ python =
 [gh-actions:env]
 DJANGO =
     2.2: dj22
-    3.1: dj31
     3.2: dj32
+    4.0: dj40
     main: djmain
 
 [testenv]
@@ -29,8 +29,8 @@ deps =
     pytest-cov
     mock>=2.0
     dj22: Django>=2.2,<2.3
-    dj31: Django>=3.1,<3.2
     dj32: Django>=3.2,<3.3
+    dj40: Django>=4.0,<4.1
     djmain: https://github.com/django/django/archive/main.tar.gz
 setenv =
     DJANGO_SETTINGS_MODULE = settings